Knitting-machine



(No Model.) 14 Sheets-Sheet 1.

J. F. NELSON. KNITTING MACHINE.

No. 585,589. Patented June 29,1897] (No Model.) 14 Sheets-Sheet 2.

' J. P. NELSON.

KNITTING MACHINE.

No 585,589. Patented June 29, 1897.-

14 Sheets-Sheet 3.

(No Model.)

J.F.NELSON. KNITTING MACHINE.

No. 585,589. Patented June 29,1897.

r uonma PETERQ on. PNOYO-LITMQ, wAsnmm'on, n c.

14 Sheets-Sheet 4.

(No Model.)

J. P. NELSON. KNITTING MACHINE. .No.585,589. Patented June 29,1897.

unnuimnn I munnlmmm WIWIHIII lllll llHlHr p i HMNHHMIIIIIIMINHHHIHI (No Model.) '14 Sheets-Sheet 5.

J. P. NELSON.

KNITTING MACHINE,

No. 585,589. Pdtented June-29, 1 897.

(No Model.) 14 Sheets-Sheet 6.

J. F. NELSON.

KNITTING MACHINE.

No. 585,589.. i1 Patented June 29,1897.

(No Model.) 14 Sheets-Sheet 7.

J. P. NELSON. KNITTING MACHINE.

No. 585,589. Patented-June 29; 1897.

(No Model.) 14 Sheets8heet 8.

J. P. NELSON.

KNITTING MACHINE.

No. 585,589. Patented June 29,1897.

R R u a ffi m: LN

(No Model.) 14 Sheets-Sheet 9. J. I. NELSON,

KNITTING MACHINE. Patented June 29,1897.

N W E: EEZZIEE "1 MIN "imi' n with Nowlmf 5 8 9 "Inf ll"! "'limm Lulu "m E; m W

(No Model.) 14 Sheets-Sheet11.

J. F. NELSON. KNITTING MACHINE.

I A u I"! gggg .l Allll a Patented June 29,1897.

wi/ime/aow (No Model.) 14 sheets-sheet 12,.

J. F. NELSON. KNITTING MACHINE.

No. 585,589. Patented June 29,1897.

(-No Model.) 14 Sheets Sheet 13. J. F. NELSON. KNITTING MACHINE.

Patented June 29 1897.

m: wcmms warns co. nmauwo. WASHINGTON, 01c.

14 Sheets Sheet 14.

(No Model.)

J. F.NELSON. KNITTING MACHINE.

. n1: "cams PEYERS co. mom-Lima, wesnmc'mn. 01c.

UNITED STATES PATENT OFFICE.

JOIIN E. NELsoN, or ROCKFORD, ILLINOIS.

KNITTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 585,589, dated June 29, 1897.

Application filed May 22, 1896. Serial No. 592,606. (No model.)

To aZZ whom it may concern:

Be it known that I, JOHN F. NELSON, a citizen of the United States, residing at Rockford, inthe county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Knitting-Machines, of which the following is a specification.

This invention relates to knitting-machines of the class known as straight-row or parallel-row knitting machines, especially to the type of this class of machines known as the Nelson machine, now extensively used at Rockford, Illinois, and shown in Letters Patent to John Nelson, No. 214,308, of April 15, 1879, and No. 576,881, of February 9, 1897. These machines are adapted to knit tubular goods generally, but are especially adapted for knitting socks and hose.

The Nelson machine in operation knits the toe and the heel by the needles of the back row only and the foot and the leg of the sock or stocking by the needles of both the front and back rows. In knitting the toe and the heel the needles of the back row knit twice for each reciprocation or double stroke of the cam-carrying slide, but while knitting the foot and leg the needles of the front and back rows are each actuated but once for each reciprocation or double stroke of the camcarrying slides, one round being knit at each reciprocation.

The object of my invention is to increase the speed of knitting by causing all the me dles, when knitting the foot and leg of the sock or stocking, to knit twice during each reciprocation of their cams. For this purpose I employan auxiliary yarn-carrier which lays yarn in the needles of both the front and back rows, which are advanced after their retraction immediately following the passage of the first or main yarn-carrier that is to say, all the needles are actuated twice during a stroke of their cams in one direction and take yarn at two different points from the main and auxiliary yarn-carriers, thus knitting two rows instead of one, as hereto- -"fore, at each reciprocation of the slides.

Therefore the output of the machine is obviously largely increased. Practically it takes half as long as formerly to knit the foot or that part of the sock between the toe and the heel and half as long to knit the leg or that part of the sock above the heel.

My improvements may be embodied in machines dilfering in details of construction, but in the accompanying drawings 1 have shown them as embodied in the Nelson machine and have shown so much of such a machine as is necessary to understand the construction, organization, and operation of my present improvements. I

Figure 1 shows a plan of aNelson knittingmachine embodying my improvements, the casing, of the cylinder being shown in dotted lines. Fig. 2 shows a front elevation of the same; Fig. 3, a righthand side elevation with some of the parts broken away; Fig. 4, a lefthand side elevation. Fig. 5 shows, on an enlarged scale, a transverse section on the line 5 5 of Fig. 2. Fig. 6 shows, on an enlarged scale, a transverse section on the line 6 6 of Fig. 2, but looking in the opposite direction from that in which Fig. 5 is viewed. Fig. 6- shows in perspective and in section the manner of securing to the front slide an abutment for the auxiliary advancing cam. Fig.

Fig. 8 shows a rear View of the same, illustrating particularly the construction and operation of the pitmen which actuate the yarncarriers and the cam-slides and the presserhook-operating mechanism. Fig. 9 is a detail view, on an enlarged scale, in transverse section on the line 9 9 of Fig. 2, showing particularly part of the mechanism for actuating the switches which control the grooves forming part of the needle-cam-actuating mechanism and also part of the mechanism for shifting some of the cams. Fig. 10 shows a transverse section on the line 10 10 of Fig. 7. Fig. 11 is a detail View in section, of the auxiliary yarn-carrien' Fig. 12 is a view, partly in elevation and partly in section, on a larger scale, of the auxiliary yarn-carrier. Fig. 12 is a detail view of part of the presser-hookactuating mechanism. Fig. 13 shows a View of the pattern-cylinder developed. Fig. 14 is a detail view, on an enlarged scale and in section, showing particularly the mechanism for operatingone of the switches at the rear of as they appear in Fig. 21.

slide and its cams, showing the arrangement nel plates.

operation.

the machine. Fig. is a rear View of part of the mechanism shown in Fig. 14. The remaining figures of the drawings show the cams for operating the front and back rows of needles and their actuating mechanism. Fig. 16 is a detail plan View of the front slide. and its cams, showing their position when the toe of the sock is being knit by the needles of the back row, it being understood that the front needles remain inoperative while the toe is being knit, although, of course, the front slide is reciprocated with the back slide. Fig. 17 is a bottom plan View of the front slide and its cams, showing how the cams pass the needle-operating devices without actuating them. Fig. 18 is an edge view of the front slide, cams, &c., shown in Figs. 16 and 17. Fig. 19 is a detail View, on an enlarged scale and in seci tion, of a portion of the front slide and the operating devices carried thereby. Fig. 20i shows a longitudinal section of the front slide and its cams, the mechanism being in the same position as that shown in Fig. 17. This figure also shows the cam-grooves for raising I and lowering the cams. Fig. 21 is a bottom plan view of the front slide and its cams, L showing particularly the arrangement of the cams when knitting two or ten rounds at the I end of the formation of the toe and at the top of the sock, respectively. Vhen the cams are thus arranged, only one yarn-carrier is in operation. Fig. 22 is a similar view, but shows the operation of the cams when the slide is moved in the opposite direction to that in i which it is supposed to move in Fig. 21. Fig. l 23 shows a longitudinal section of the front j slide and its cams, the parts being arranged 3 This figure also shows the grooves for raising and depressing the cams. Fig. 24 is a detail top plan view 3 of the front slide, showing particularly the means whereby the cams are operated. WVhen in the position shown in Fig. 24, both yarn carriers are used and the foot or the leg portion of the sock is being formed. Fig. 25 is a bottom plan view of the front slide and its cams withthe parts in the position shown in Fig. 24: and the slide moving to the left. When the slide is moved to the right, the cams will assume the position shown in Fig. 22. Fig. 26 is a bottom plan view of the back 1 of the cams when the needles are knitting the 1 heel and toe and when the slide is moving to the left. Fig. 27 is a similar view showing the arrangement of the cams when the slide is moving to the right. Fig. 28 shows a longitudi- I nal section of the back slide and its cams with the mechanism arranged as it appears in Fig. 26. This figure also shows the grooves for operating the cam-shifting mechanism. Fig. 29 shows a bottom plan view of the back slide with the cams arranged to knit the two or ten rounds at the end of the toe and top of the sock, respectively. The slide is supposed to move to the right, and one yarn-carrier'is in When the cams on the backslide are arranged as in this figure, the cams on the front slide are arranged as they appear in Fig. 21. Fig. 30 is a similar View, but shows the arrangement of the cams when the slide is moved to the left. Fig. 31 shows a longitudinal section of the back slide and its cams, the mechanism being arranged as it appears in Fig. 29. This figure also shows the grooves for operating the cam-shifting mechanism. Fig. 32 shows a bottom plan View of the back slide and its cams and indicates the arrangement of the cams when the needles are knitting the foot or the leg of the sock and both yarn-carriersarebeingused. Theslideissupposed to be moving to the right. In the return movement to the left the cams assume the position shown in Fig. 30. Fig. 33 shows a longitudinal sectional view of the back slide and its cams with the mechanism arranged as shown in Fig. 32. This figure also shows the grooves for operating the cam-shifting mechanism. Fig. 34 is a detail longitudinal section of the back slide and the parts carried thereby. Fig. 35 shows a plan view thereof.

The driving shaft A, extending transversely of the machine, is mounted in suitable bearings z in the main frame A, which may be of any suitable construction. Ahandwheel A is secured to the front end of the driving-shaft, and atits rear end the drivingshaft is provided with fast and loose pulleys, as usual. A pinion a on the driving-shaft meshes with a main actuating gear-wheel a on a stud-axle a, mounted in suitable bearings z and connected with a cam-wheel or irregular snail-gear B, which gears with a star-pinion B for operating the pattern-cylinder, as will hereinafter be explained.

A front needle-bed O and rear needle-bed O are each slotted and provided with a slotted steel plate 0 to constitute guide-grooves for the front and rear rows of needles Z) 12 respectively, aswell as for their jacks B B The bed-plates are inclined as heretofore and provided each with a lower longitudinal grooved guide-bar or channel-plate C and an upper longitudinal grooved guide-bar or channel-plate 0 A front main cam-slide C and a back main cam-slide O rigidly connected by a yoke c, reciprocate longitudinally in their guideways in the front and back chan- These main cam slides carry cams for actuating the two rows of needles to advance and retract them and are reciprocated by the mechanism next to be explained.

An elbow-lever c pivotally mounted upon the main frame-bracket c by a stud 0 is connected at the upper end of its longer arm with a bracket 0 on the back main cam-slide C by means of a pitman or link 0 The other end, or the shorter arm of the elbow-lever, is linked by a connecting-rod b with a wrist-pin b on the gear-wheel a. The result of this construction is that the main cam-slides are 1 caused to reciprocate together or make two strokes for each revolution of their actuatinggear a and to operate the two rows of needles in dotted lines in Fig. 7.

devices for feeding a plurality of yarns.

by. their cams in the manner hereinafter described.

The main yarn-carrier D comprises a rear longitudinal frame-bar d and a front framebar dflconnected at one end by an end piece D The frame-bars are guided in ways formed in the adjacent or inner edges of guide-bars D, secured to the needle-beds over their inner edges above and on oppositesides of the central opening from the needles.

the front and back rows of needles and with shoes 01 for holding down the needles against any tendency to rise out of operative position when in action. A dome d is secured to the frame-bar d and serves to support the usual In Fig. 5 it is shown in dotted lines as provided with a tube through which yarn may be guided to the eye 61 A- cam-carrier E, provided with cams for actuating the presser-hooks A. at the front of the machine, is connected with the frame of the yarn-carrierin the manner hereinafter described. Fig. 7 shows clearly the construction and arrangement of the devices for actuati-ng the front presser-hooks. The camcarrier E is mounted on a bar 6 which is provided with ribs 6 which are adapted to reciprocate in guides in the front bars D and C The ribs e are provided with a recess 6 in which fits the end of an arm 6, se-' cured at e to a yoke 6 secured to the end piece D of the yarn-carrier frame. The yoke e overlaps the end piece D and the screws shown in Fig. 7 secure the yoke to the end piece, whichlies under it. This cam-carrier moves coincidently with the yarn carrier frame and has no movement independently thereof. It carries two cams e e, as indicated One of said cams actuates the presser-hooks for the main yarncarrier, and the other one actuates the presserhooks for the auxiliary yarn-carrier. The

presser-hooks D on the opposite side of the machine are actuated by a main presser-hook cam E and an auxiliary presser-hook cam E The main cam E is shown in dotted lines in Fig. 7. It is connected by a plate 6 with the rib e on the slide 6 which is form ed, as heretofore, to reciprocate in suitable guides in the bars C and D. In like manner the cam. carrier or slide E for the front row of presserhooks slides in guides in the corresponding bars D and C and both slides are tapered at their ends to readily pass by the upwardlyprojecting ends of the presser-hooks.

The main presser-hook cam for the back row of needles has a movement independently of the yarn-carrier, its slide e having secured to it two upwardly-projecting lugs e a", between which projects a downwardly-extending tooth e on the pitman E By this arrangement it will be observed that at each end of the stroke many years in the Nelson machines, and is substantially the same as that shown in the Nelson patent, No. 576,881, above mentioned. Inasmuch as the needles of the back row are operated for forming the toe and the heel of the sock while the front row is inactive, and inasmuch as in my machine the auxiliary yarn-carrier is only used while both sets of needles are in operation, it is desirable (and, in fact, necessary in the machine as here shown) that the cam for operating the back pressenhooks for. the auxiliary. yarn-carrier should be detached from the camfor operating the presser-hooks for the main yarn-carrier during the formation of the heel and the toe, and it should be brought into operation only when both sets of needles and both yarncarriers are in use.

The camE is formed on a slide .F, adapted to reciprocate in a groove formed in theback bar D. When out of operation, it stands at the left-hand end of the machine. The slide a is provided with a catch-pawl F, pivoted at f, and its front endgis pressed toward the front of the machine by a springf. At its front end the catch-pawl is formed with a notch f adapted to engage with a lug f on separation of the catch-pawl F with the auxiliary cam E is controlled by an arm F at the left-hand end of the machine, which, when turned to the left, as shown in Fig. 4:, bears upon the catch-pawl F and so moves it that it will reciprocate Without engaging with the auxiliary cam, but when the arm F is moved to the right, as viewed. in Fig. 7 the catchpawl is free to engage with the auxiliary cam when at the end of itsstroke to the left and willthen carry it back and forth with the main cam E until the arm F is again operated to separate the pawl from the cam E, which will then be left at the left-hand end of the machine, as before, in. position ready to be taken up by thccatch-pawl when needed; A bent finger f prevents. the auxiliary cam E from moving too far to the left. Thearm F is pivoted to the rear bar D, and at its lower end it is connectedwith a. link F joined to a bell-crank lever F pivotally connected with a bracket F depending from the casing A The shorter arm of the bell-crank lever engages at times with one or the other. of the IIO , hook cam E.

that it may act on all of them.

ing a lug e projecting from the yarn-carrier. The pitman E is pivotally connected to the upper end of a lever Gr, jointed at g to the elbow-lever c and provided at its lower end With a roller-carrying stud g, engaging the forked end of a lever g pivoted at g to the main frame-bracket c and at its upper end carrying a roller g, which enters a groove in the actuating gear-wheel d. This groove is suitably shaped to give the proper movement to the yarn-carrier and to the cams for operating the presser-hooks, allowing of the usual proper amount of dwell at each stroke and at the proper times.

The pitman c carries a latch E, pivoted at e and having a shoulder at 6", adapted to engage with a laterally-projecting pin 6 on the right-hand lug e of the slide of the presser- The arrangement is such that after the yarn-carrier has stopped moving and the main cam-carrying slides C 0 continue to move to the right the latch will engage the pin 6 and will further move the main back presser-hook cam E, so that it may be drawn to the right beyond the Presser-hooks in order At the opposite end of the'machinethat is to say, the left-hand endthe arrangement is such that the cam-slides may move a short distance while the yarn-carrier is at rest, and the latch will fall in behind the pin a. The yarn-carrier then assumes a position in advance of the presser-hook cams and the mechanism then moves to the right. While the details of construction are somewhat varied from those I shown in the Nelson patents above referred ment of the bell-crank lever D to, the mode of operation is substantially the same. A bell-crank lever D is pivoted at d to the main frame, and one of its arms carries a stud d, entering a groove in the pattern-cylinder. The other is provided with a head d suitably shaped to act upon the incline e of the latch E to raise it after it has moved the cam in order that the cam-can rying slides may move without moving the yarn-carrier or the presser-hook-actuating cams.

The drawings show the pitman E as pro- 'vided with an inclined flange 0 which is adapted to ride over the head d of the bellcrank lever D when the latter is moved into its path. This occurs when a sock is completed, and the yarn-carrier is stopped when 1 the needles are being operated to cast off the row. It is actuated by means of a pinion h on a shaft h, with which the star-Wheel B is connected. This pinion is provided with a single laterally-extending tooth k adapted to gear with the segments I I on the patterncylinder. The pinion itself engages with teeth 71 formed on the cylinder.

As in the prior Nelson machines, the pinion h turns the pattern-cylinder G by its engagement with the teeth It therein when the toe and the heel are being formed. When that part of the stocking between the toe and the heel and that part above the heel are being formed, the pinion It will occupy one of the spaces 1, 2, 3, or 4:1[1 the pattern-cylinder, while the tooth 77, will engage one of the segments I or I. These segments do not form any part of my invention. They are the same in construction and operation as those of the prior Nelson machines andas shown and described in the Nelson Patent No. 576,881, of February 9, 1897, above mentioned. Briefly stated, however, the operation is to cause the pattern-cylinder to remain at rest while the foot or the leg of the stocking is being formed, permitting both the front and back rows of needles to be operated and to cause the pattern-cylinder to come into operation at the proper times to fashion the toe or the heel. The pattern-cylinder is, however, provided with grooves and suitably-formed surfaces for operating the devices used in my improved machine for actuating the auxiliary yarn-carrier and the mechanism used in connection therewith.

The auxiliary yarn-carrier in the present instance is shown as consisting of a vertical arm J, provided with a guide-groove j for the yarn, and having at its lower end a lateral extension j, secured to a transversely-moving slide j which has a dovetail connection with the yarn-carrier-supporting slide J, that is adapted to reciprocate back and forth on a guide-bar J parallel with the front main cam-slide- The slide 7' is free to move at times transversely of the supporting-slide J and carries on its under side a pin j which projects into a groove formed in the guidebar J By this means the slide j is given its transverse movement and is held in position when moving straight across the machine. The guide-bar'J as shown in Fig. 7, is provided on its upper side with a groove 9' extending from end to end thereof, but provided with inclined portions 7' which remove a portion of the groove laterally from the end portionsthat is to say, the groovej extends from the left-hand end of the guidebar toward the right, is then bent or inclined at 3' inwardly toward the center of the machine, and then extends along the inner edge of the guide-bar parallel with the portion of the groove at the left end thereof, is then bent or inclined inwardly, and joined with the portion of the groove 3' at the right-hand end of the machine, corresponding in all respects with that at the left-hand end.

The supporting-slide J is adapted to move from end to end of the guide-bar J and the pin j moves from end to end of the guidegroove j, causing the yarn-carrier at first to move away from the right-hand end of the machine, with its delivery end removed from the needles in which the yarn is to be laid, to the inner portion of' the groove between the inclined portions 7' so as to cause the delivery end of the yarn-carrier to move over the needles in which the yarn is to be laid. The yarn-carrier is withdrawn at the opposite end of the guide -bar when the pin j passes down the incline and into that portion of the groove at the left-hand end of the machine. The inner end of the slide j carries a hanger f, which has a vertical opening through which the yarn is fed. The yarncarrier is tapered or suitably formed at its opposite ends to pass over the needles and act upon them in the usual way, as in other yarn-carriers.

A catch-pawl J is pivoted at j to the slide J and is provided at one end with a hook j, pressed downwardly by a springj The end of the catch-bar opposite the hooked end is provided with a double incline j, adapted to engage with a pin K, projecting from the arm of a frame K. The arm 70 projects over the right-hand end of the guide-bar J and the frame to which it is attached extends downwardly therefrom, then inwardly, then forwardly, and then laterally across the front of the machine,being pivoted at 74; to a bracket extending downwardly from the bed of the machine. It is then prolonged and pivotally connected with a lever Kipivoted to a bracket 70 and having its left-hand end connected with a vertical rod K which is connected at its lower end with a shoe K pivoted on a bracket K This shoe has a pointed rear end or toe k which is held upon the periphery of the cylinder or caused to enter a groove therein by a spring M, which presses upon the rear end of the shoe.

A yarn-carrier-actuating slide L on the guide-bar J 2 is connected by a pitman L with an arm Z on the yoke c. The pitman is slotted at Z, and the yoke has a movement independent of the movement of the slide at each end of each stroke, as will be obvious from the construction shown. The slide L has a socket Z adapted to receive the hook j on the catch-pawl J When the arm 7.: is moved or held to depress the pin K, the hook j will be elevated and the slide L will reciprocate without carrying with it the auxiliary yarncarrier; but when the arm 70 iselevated the hook 9' will enter the socket Z and the slides L and J will be connected and reciprocate together. When the auxiliary carrier is in operation, it always follows the main yarncarrier, and when the yarn-carriers arrive at the end of a stroke the auxiliary yarn-carrier is moved laterally out of the path of the main yarn-carrier. The main yarn-carrier is moved for a short distance to the left without movmoved. with the main yarn-carrier, the pin 9' guiding it first forwardly and then transverse] y behind the main yarn-carrier. At the left-hand end of the machine substantially the same operation occurs, viz: The auxiliary yarn-carrier is withdrawn laterally and is held until the main yarn-carrier has moved some distance to the right. Then it is again brought into operative position.

The needles I) and b are of usual construction and are mounted in jacks B B as heretofore, which are provided with upwardly-proj ecting lugs 27 as usual. The needles are also supported by swinging supports M in the usual manner, and the fashioningmeedles of the back row have their jacks mounted in supports N, constructed and operated in the same manner as in the prior Nelson machines. The grooves in the pattern-cylinder for operating the supports of the fashioningmeedles are indicated diagrammatically in Fig. 13.

The presser hooks are constructed and mounted in the same way as heretofore, being pivoted at m, as indicated in Fig. 5.

The needle-supports rest on longitudinal bars M M ,of usual construction. These bars may be moved longitudinally to lower the needle-supports to permit the needles to be removed and replaced. One of said bars M is actuated at the proper time to operate the dropping-needle that is, the needle which holds the thread when beginning to knit a stocking. M indicates the lever which moves the bar M laterally to depress the droppingneedle, and M indicates the springcatch which dogs the bar, while M indicates the vertically-n1oving pin which actuates the dog M to release the bar M after the droppingneedle has performed its function. The pin M is operated by an arm M secured to the back cam-slide O Aspring 1W1 tends to push the bar M backwardly, as viewed in Fig. 4. This mechanism forms no part of my invention, as it has long been used in the Nelson machines.

The front main cam-slide G is slotted at O O, and through these slots extend screws 0, which are connected with a bar 0 on the under side ofv the slide. The construction is such as to permit the bar to have a longitudinal adjustment, if necessary. To the bar 0 is pivoted a lever 0 to which is secured a triangular cam 0 The lever is extended beyond this cam and has a projection 0 which extends through a slot 0 in the slide 0 This projection carries a lug 0 which enters a guide-groove hereinafter described. The extension 0 is connected by a slot-and-pin connection with a lever 0 which is connected with another lever 0 The levers 0 and 0 are rigidly connected together, as shown in Fig. 17. As there shown, thelever 0 extends but a short distance beyond its pivot 0 It is then continued laterally, as shown in dotted lines in Fig. 17, and joins the lever 0 as there indicated. These levers o 'and 0 are provided at their ends with lugs o 0 and they are arranged on opposite sides of a guideblock 0 The arrangement is such that when the cam O is depressed the lugo will be elevated and the lug 0 depressed. There is a space 0 between the cam O and guide-block Oflwhich is open when the cam O is depressed, but closed by the lug 0 when the cam O is elevated. An arm 0 extends through an opening 0 in the slide 0 and is secured to a lever 0 pivoted at 0 to the under side of the slide 0, and pressed backwardly by a spring 0 The lever O carries a triangular auxiliary advancing-cam 0 which is only used when the auxiliary yarn-carrier is in operation.

A retracting-cam P, of usual construction, is provided with an extension 19, which has a sliding connection with guides p and a triangular. retracting-cam P has an extension 19 having a sliding connection with guides 19 on the under side of the slide C These cams P and P are connected with a tension-bar P which is secured at its opposite ends to the arms P projecting upwardly and forwardly from a rock-shaft P, which has secured to it a rearwardly-extending arm P having a setscrew P held in a guide in the periphery of the pattern-cylinder by a spring 13 A short rail 1?, formed of a piece 19 and a wearingpiece p, is arranged on the under side of the front slide opposite the cam O and acts as an abutment to limit the movement of this cam forwardly or away from the cams P and P. The rail is shown as secured to an arm which is secured by a screw 19 to the top of the slide 0 and which extends down through the slot 0 in the slide and is then bent laterally and secured in any suitable way to the part 19 of the rail. The wearing-piece 19 is secured bya screw, as shown, to the inner portion of the rail. The auxiliary cam O is recessed at 0 to clear the arm p as it moves toward the rail P This construction is very clearly shown in Fig. 6 besides being correctly shown in other figures of the drawings. The rail P is so shaped as to form a continuation or a part of the cam 0 when said cam is in operation, as indicated in Fig. 25, and as there shown the two parts 0 and P form a cam of sufficient size to properly operate the jacks, but when the cam O is out of operation, as shown in Fig. 21, the lugs on the jacks can move straight across the cam 0 as there indicated. If the part P were also retracted, this part would project beyond the edges of the cams P and P and would interfere with the proper operation of the machine. It will thus be understood that the rail P acts not of this class. The auxiliary advancing-cam O is operated to actuate the needles when the auxiliary yarn-carrier is in use. WVhen the auxiliary yarn-carrier is not in use, the cam is in the inactive position shown in Figs. 17, 21, and 22. When the cam O is active, it occupies the position shown in Fig. 25.

The arm 0 carries at its outer end a lug 10 which, when the auxiliary yarn-carrier is in operation, traverses a guideway on the front channel-bar 0 This guideway is formed by a rail Q, a short plate-Q and a switch q. There is a short space between the rail Q and the plate Q When the lug p traverses the guide, it first passes along the rear side of the rail Q, around switch q, then along the front side of the rail, then between the left-hand end of the rail and the plate Q and then back again along the rear side of the rail. When the lug on the arm 0 traverses this guideway, it will throw the auxiliary cam 0 into and out of operation at each reciprocation or double stroke of the front cam-slidethat is to say, on the stroke from left to right the auxiliary cam will be out of operation, while on the stroke from right to left the auxiliary cam will be in operation, as indicated in Fig. 25.

The switch q is operated at the proper times by connections with the frame K. An arm g on the switch projects forwardly past a spring g which presses the end of the arm against the upper end of a bell-crank lever 1 pivoted at g to the frame of the machine and having its lower end arranged under a pin g projecting from the frame K. The upper end of the lever g is guided by a slotted plate q". The organization is such that when the frame K is raised to permit the auxiliary yarncarrier to commence operating the lever (1 will be released and the spring will move the arm q and thereby the switch q.

The lug 0. on the arm 0' is adapted to enter a guide in the front channel-plate or guide-bar 0 This groove is formed on opposite sides of a rail R, which has at one end a switch 1" and at the opposite end a switch r. The switch 1" is. pressed downwardly by a spring r and is not connected with any operating mechanism, butis free to be raised and lowered by the lug 0 The switch 0", however, is positively actuated by a rod R, which is connected with the switch by a pin- 1' that extends through a slot r in the rod. The pin r is normally raised by a spring r At its lower end the rod R is connected with a shoe R having at front and rear triangular projections or lugs r which are adapted to enter grooves in the patterncylinder or to bear upon the periphery thereof. The arrangement is such that at the proper times the rod R is operated to shift the switch '1" to the position shown in Fig. 23, causing the lug 0 to reciprocate first above the rail R and then below it, thus shifting the cam O at each reciprocation or double stroke of the slide. The spring r and the 

